net.sourceforge.phpeclipse/src/net/sourceforge/phpdt/internal/core/DiscardWorkingCopyOperation.java

   1 /*******************************************************************************
   2  * Copyright (c) 2000, 2004 IBM Corporation and others.
   3  * All rights reserved. This program and the accompanying materials
   4  * are made available under the terms of the Common Public License v1.0
   5  * which accompanies this distribution, and is available at
   6  * http://www.eclipse.org/legal/cpl-v10.html
   7  *
   8  * Contributors:
   9  *     IBM Corporation - initial API and implementation
  10  *******************************************************************************/
  11 package net.sourceforge.phpdt.internal.core;
  12
  13 import net.sourceforge.phpdt.core.IJavaElement;
  14 import net.sourceforge.phpdt.core.IJavaElementDelta;
  15 import net.sourceforge.phpdt.core.JavaModelException;
  16
  17 /**
  18  * Discards a working copy (decrement its use count and remove its working copy info if the use count is 0)
  19  * and signal its removal through a delta.
  20  */
  21 public class DiscardWorkingCopyOperation extends JavaModelOperation {
  22
  23         public DiscardWorkingCopyOperation(IJavaElement workingCopy) {
  24                 super(new IJavaElement[] {workingCopy});
  25         }
  26         protected void executeOperation() throws JavaModelException {
  27                 CompilationUnit workingCopy = getWorkingCopy();
  28
  29                 int useCount = JavaModelManager.getJavaModelManager().discardPerWorkingCopyInfo(workingCopy);
  30                 if (useCount == 0) {
  31                         if (!workingCopy.isPrimary()) {
  32                                 // report removed java delta for a non-primary working copy
  33                                 JavaElementDelta delta = new JavaElementDelta(this.getJavaModel());
  34                                 delta.removed(workingCopy);
  35                                 addDelta(delta);
  36                                 removeReconcileDelta(workingCopy);
  37                         } else {
  38                                 if (workingCopy.getResource().isAccessible()) {
  39                                         // report a F_PRIMARY_WORKING_COPY change delta for a primary working copy
  40                                         JavaElementDelta delta = new JavaElementDelta(this.getJavaModel());
  41                                         delta.changed(workingCopy, IJavaElementDelta.F_PRIMARY_WORKING_COPY);
  42                                         addDelta(delta);
  43                                 } else {
  44                                         // report a REMOVED delta
  45                                         JavaElementDelta delta = new JavaElementDelta(this.getJavaModel());
  46                                         delta.removed(workingCopy, IJavaElementDelta.F_PRIMARY_WORKING_COPY);
  47                                         addDelta(delta);
  48                                 }
  49                         }
  50                 }
  51         }
  52         /**
  53          * Returns the working copy this operation is working on.
  54          */
  55         protected CompilationUnit getWorkingCopy() {
  56                 return (CompilationUnit)getElementToProcess();
  57         }
  58         /**
  59          * @see JavaModelOperation#isReadOnly
  60          */
  61         public boolean isReadOnly() {
  62                 return true;
  63         }
  64 }